On the Core Analysis of R 144 Well in Kurokawa Oil Field, Akita Prefecture

Abstract

Chemical analysis was carried out for the core samples obtained from R 114 well in the Kurokawa oil field, in 1954.
Samples are following eight cores.
Tentokuji dark grey silt stone .......................................50m, 100m, 150m in depth.
Funakawa black shale .............................................200m, 250m, 300m in depth.
Onnagawa siliceous shale ........................................................350m in depth.
Andesite ......................................................400m in depth.
Specific gravity of wet core samples, water content, color of H₂O extraction, Cl-, HCO₃-, NH₄+, O₂ and N₂ consumption, SiO₂, TiO₂, Fe2O₃, Al2O₃, MgO, CaO, Ignition loss, +H₂O, -H₂0 and organic matter were determined In this core analysis, the most important fact is the correspondence of the boundaries of chemical characters, microbiofacies and lithofacies. The first boundary exists about 150-200m in depth, and the crude oil exists at 150 and 400m deep.
It is necessary to survey the whole area of oil-bearing Tertiary basin using the Two geochemical methods, namely analysing the oil field brines and the cores.